"Frog" Pond Community PPT Courseware 2

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"Frog" Pond Community PPT Courseware 2

Observe the appearance and characteristics of frogs

Forelimbs: short, four-fingered, supporting head and trunk

Hind limbs: five toes, webbed between toes, suitable for jumping and swimming

Do not harm the frog during the observation, and return the frog to nature after the observation.

Experiment: Study the role of frog's webbed feet when moving in water

experiment procedure

1. Open your fingers, put your hand into the sink filled with water, swing it back and forth, and experience the feeling.

2. Put a plastic bag on your hand, tie it with a rubber band at the wrist, spread your fingers as far as possible, put it into the sink and swing it back and forth to experience the feeling.

Experiments show that when we put on a plastic bag on our hands and open our fingers to paddle in the water, it is like opening the webbed feet of a frog, which increases the contact area with the water and increases the resistance, which is more conducive to swimming in the water. Produce reverse thrust. Frogs use the webs on their webbed feet to generate reverse thrust during paddling in the water, allowing them to swim quickly in the water.

Let’s talk about it: What stages does a frog go through in its life? What is the living environment like at each stage?

Egg, tadpole, young frog, adult frog

What we found

1. Characteristics of the frog body: it can be divided into three parts: head, trunk, and limbs. The forelimbs are short and short with no webbing between the toes; the hind limbs are thick and the toes are webbed;…

2. There are several stages in a frog's life: egg, tadpole, young frog, and adult frog.

When frogs are young, they live in water and breathe with their gills; when they grow up, they live on land and breathe with their lungs.

How are animals like frogs and toads different from birds, fish, and mammals?

Animals like frogs and toads are amphibians

What other animals do we know are amphibians? Tell me your reasons.

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For more information about the "Pond Community Frog" PPT courseware, please click the Pond Community ppt Frog ppt tag.

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Update Time: 2024-08-10

This template belongs to science courseware E-education edition fifth grade science volume 1 industry PPT template

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